U.S. patent number 10,825,872 [Application Number 16/586,955] was granted by the patent office on 2020-11-03 for self-light emitting display device for improving light extraction efficiency and increasing life span.
This patent grant is currently assigned to LG DISPLAY CO., LTD.. The grantee listed for this patent is LG Display Co., Ltd.. Invention is credited to Sooin Kim, Wonrae Kim, Seungbum Lee.
United States Patent |
10,825,872 |
Kim , et al. |
November 3, 2020 |
Self-light emitting display device for improving light extraction
efficiency and increasing life span
Abstract
A self-light emitting display device comprises at least one
pixel comprising a first region, a second region and a third
region; a blue light emitting diode disposed in the at least one
pixel and configured to emit blue light; partitions disposed over
the blue light emitting diode and spaced apart from one another,
the partitions defining the first region, the second region and the
third region; a color conversion pattern disposed over the blue
light emitting diode and including a red color converting unit
disposed between the partitions in the first region and configured
to convert the blue light into red light and a green color
converting unit disposed between the partitions in the second
region and configured to convert the blue light into green light;
and a selective transmission layer configured to transmit the blue
light and to reflect the green light and the red light and
comprising a first selective transmission region corresponding to
the first and second regions, wherein the first selective
transmission region includes a first bottom portion disposed
between the color conversion pattern and the blue light emitting
diode, and a first wall portion disposed between the color
conversion pattern and partitions and extending from the first
bottom portion.
Inventors: |
Kim; Sooin (Seoul,
KR), Lee; Seungbum (Gimpo-si, KR), Kim;
Wonrae (Paju-si, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
LG Display Co., Ltd. |
Seoul |
N/A |
KR |
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Assignee: |
LG DISPLAY CO., LTD. (Seoul,
KR)
|
Family
ID: |
1000005158784 |
Appl.
No.: |
16/586,955 |
Filed: |
September 28, 2019 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20200105838 A1 |
Apr 2, 2020 |
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Foreign Application Priority Data
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Sep 28, 2018 [KR] |
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10-2018-0115628 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01L
27/322 (20130101) |
Current International
Class: |
H01L
29/08 (20060101); H01L 27/32 (20060101) |
Field of
Search: |
;257/40 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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6019992 |
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Oct 2016 |
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JP |
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10-2017-0014755 |
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Feb 2017 |
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KR |
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Primary Examiner: Henry; Caleb E
Attorney, Agent or Firm: Polsinelli PC
Claims
What is claimed is:
1. A self-light emitting display device, comprising: at least one
pixel, each pixel comprising a first region, a second region and a
third region; a blue light emitting diode disposed in the at least
one pixel and configured to emit blue light; partitions disposed
over the blue light emitting diode and spaced apart from one
another, the partitions corresponding to boundary of each of the
first region, the second region and the third region to define the
first region, the second region and the third region; a color
conversion pattern disposed over the blue light emitting diode and
between the partitions, wherein the color conversion pattern
includes a red color converting unit corresponding to the first
region and configured to convert the blue light into red light and
a green color converting unit corresponding to the second region
and configured to convert the blue light into green light; a color
filter pattern disposed over the color conversion pattern and
between the partitions; and a selective transmission layer
configured to transmit the blue light and to reflect the green
light and the red light, wherein the selective transmission layer
includes a bottom portion facing to the blue light emitting diode
and a wall portion facing to an inside surface of each of the
partitions and vertically extending from the bottom portion, and
wherein, in the first and second regions, the wall portion of the
selective transmission layer is disposed between the inside surface
of each of the partitions and the color conversion pattern but also
between the inside surface of each of the partitions and the color
filter pattern.
2. The self-light emitting display device of claim 1, wherein the
color filter pattern is configured to only absorb the blue light
and includes a first color filter unit disposed over the red color
converting unit in the first region and a second color filter unit
disposed on the green color converting unit in the second
region.
3. The self-light emitting display device of claim 1, further
comprising a white resin layer disposed over the blue light
emitting diode, disposed between the partitions in the third
region, and configured to transmit the blue light, wherein the
third region includes the white resin layer instead of the color
conversion pattern and the color filter pattern.
4. The self-light emitting display device of claim 3, wherein, in
the third region, the bottom portion of the selective transmission
layer is disposed between the white resin layer and the blue light
emitting diode, and the wall portion of the selective transmission
layer is disposed between the inside surface of each of the
partitions and the white resin layer.
5. The self-light emitting display device of claim 1, further
comprising an encapsulation layer configured to cover the blue
light emitting diode, wherein the partitions and the bottom portion
of the selective transmission layer are disposed on the
encapsulation layer.
6. The self-light emitting display device of claim 1, the selective
transmission layer further includes a top portion disposed on a top
surface of the partitions.
7. A self-light emitting display device, comprising: a pixel
comprising first, second and third regions adjacent to one another;
a blue light emitting diode disposed in the pixel and configured to
emit blue light; partitions disposed over the blue light emitting
diode and corresponding to boundary of each of the first region,
the second region and the third region to define the first, second
and third regions; first and second color conversion units
respectively disposed in the first and second regions and
configured to respectively convert the blue light to red light and
green light; a third color conversion unit disposed in the third
region and allowing the blue light to transmit, and a selective
transmission layer configured to transmit the blue light and to
reflect the green light and the red light, wherein the first color
conversion unit includes a first color conversion pattern disposed
on the bottom portion of the selective transmission layer and a
first filter pattern disposed on the first color conversion
pattern, and the second color conversion unit includes a second
color conversion pattern disposed on the bottom portion of the
selective transmission layer and a second filter pattern disposed
on the second color conversion pattern, wherein the selective
transmission layer includes a bottom portion facing to the blue
light emitting diode and a wall portion facing to an inside surface
of each of the partitions and vertically extending from the bottom
portion, and wherein the wall portion of the selective transmission
layer is disposed between the inside surface of each of the
partitions and each of the first, second and third color conversion
units.
8. The self-light emitting display device of claim 7, wherein the
selective transmission layer further includes a top portion
disposed on a top surface of the partitions.
9. The self-light emitting display device of claim 7, wherein the
third color conversion unit includes a white resin layer.
10. The self-light emitting display device of claim 7, further
comprising an encapsulation layer configured to cover the blue
light emitting diode, wherein the partitions and the bottom portion
of the selective transmission layer are disposed on the
encapsulation layer, and wherein the first, second and third color
conversion unit are disposed on the bottom portion of the selective
transmission layer.
11. The self-light emitting display device of claim 7, wherein the
first color filter pattern and the second color filter pattern
include a yellow dye and a thermosetting resin.
Description
CROSS REFERENCE TO RELATED APPLICATION
The present disclosure claims priority to and the benefit of Korean
Patent Application No. 10-2018-0115628 filed on Sep. 28, 2018,
which is hereby incorporated by reference in its entirety.
BACKGROUND
Field of the Disclosure
The present disclosure relates to a self-light emitting display
device.
Description of the Background
A display device may visually display data. As information society
develops, there may be an increase in demands for various forms of
display devices which display image. A liquid crystal display (LCD)
and an organic light emitting diode (OLED) display device may be
mainly used as such a display device.
The OLED may be a self-light emitting diode which converts electric
energy into light energy using an organic material. In general, the
OLED may have a structure in which an organic layer is disposed
between an anode and a cathode. When driving voltage is applied
between the anode and the cathode, holes may be injected through
the anode, and electrons may be injected through the cathode. In
this case, the holes and the electrons meet in the organic film and
are coupled to each other. Accordingly, excitons are generated.
When the state of the exciton is turned into a floor state, light
is emitted.
The organic film has a structure in which layers consisting of
different materials are stacked to enhance efficiency and safety of
the organic light-emitting device. For instance, the organic film
may include a hole injection layer, a hole transport layer, a
light-emitting layer, an electron transport layer, an electron
injection layer and the like.
SUMMARY
The present disclosure provides a self-light emitting display
device capable of improving light extraction efficiency and
increasing a lifespan.
The present disclosure also provides a self-light emitting display
device capable of enhancing color conversion efficiency of the
self-light emitting display device.
The problems to be solved by the present disclosure are not limited
to those mentioned above, and the problems which are not mentioned
can be clearly understood by those skilled in the art from the
following description.
According to the present disclosure, a self-light emitting display
device includes at least one pixel, a blue light emitting diode
disposed in at least one pixel and emits blue light, partitions, a
color conversion pattern, and a selective transmission layer.
The at least one pixel includes a first region, a second region,
and a third region. The partitions are disposed above the blue
light emitting diode and are spaced apart from one another. The
first region, the second region, and the third region are
partitioned by the partitions.
The color conversion pattern is disposed above the blue light
emitting diode, and includes a red color converting unit and a
green color converting unit. The red color converting unit is
disposed between the partitions in the first region to convert the
blue light into red light, and the green color converting unit is
disposed between the partitions in the second region to convert the
blue light into green light.
The selective transmission layer reflects the green light and the
red light, and includes a first selective transmission region. The
first selective transmission region includes a bottom portion and a
wall portion. The bottom portion is disposed between the color
conversion pattern and the blue light emitting diode, and the wall
portion is disposed between the color conversion pattern and the
partitions, and is connected to the bottom.
The self-light emitting display device may further include a color
filter pattern which only absorbs the blue light selectively. The
color filter pattern may include a first color filter unit and a
second color filter unit. The first color filter unit may be
disposed on the red color converting unit in the first region, and
the second color filter unit may be disposed on the green color
converting unit in the second region.
Details of other implementations are included in the detailed
description and drawings.
According to the present disclosure, the self-light emitting
display device includes a selective transmission layer which
transmits blue light and reflects red light and green light, so
that amount of recycled light of the self-light emitting display
device is increased, thereby enhancing light extraction efficiency
of the self-light emitting display device and increasing a lifespan
of the self-light emitting display device.
In addition, as high-temperature plasticity is not required to form
the color conversion pattern, deterioration in the efficiency of
the material of the color conversion pattern due to the
high-temperature plasticity may be minimized, thereby improving the
color conversion efficiency.
According to the present disclosure, the effects of the self-light
emitting display device are not limited to the contents exemplified
above, and more various effects are included in the present
disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the disclosure and are incorporated in and
constitute a part of the present disclosure, illustrate aspects of
the disclosure and together with the description serve to explain
the principles of the disclosure.
In the drawings:
FIG. 1 is a schematic view of a portion of a self-light emitting
display device according to an aspect of the present disclosure;
and
FIG. 2 is a schematic view of a self-light emitting display device
according to another aspect of the present disclosure.
DETAILED DESCRIPTION
The advantages, features, and methods for accomplishing them of the
present disclosure will become apparent with reference to
accompanying drawings as well as implementations and experimental
examples described below in detail. It is noted that the
accompanying drawings make those skilled in the art easily
understand the idea of the technology disclosed in the present
disclosure and it is not construed that the idea of the technology
thereof is limited to the accompanying drawings.
Further, the present disclosure is not limited to the matter
described below, but may be implemented in various manners, and the
matters described below are provided so that the description of the
disclosure will be complete and thorough and to fully convey the
scope of the present disclosure to those skilled in the art to
which the present disclosure pertains and the present disclosure is
only defined by the scope of claims.
When it is determined that the detailed description of the known
technology related to the present disclosure may obscure the gist
of the present disclosure, the detailed description thereof will be
omitted.
"A first", "a second", and the like are used to describe various
components, however, these components are not limited to these
terms. These terms are used to distinguish one component from
another component and a first component may be a second component
unless otherwise stated.
Unless otherwise stated, each component may be singular or plural
throughout the disclosure.
In the present disclosure, unless otherwise stated, when any
portion is referred to as "including" or "having" another
component, it means not excluding other components but further
including other component.
In the present disclosure, unless otherwise stated, "A and/or B"
means A, B or A and B. Unless otherwise stated, "C to D" means "C
or more and D or less".
Elements or layers being provided "on" or "on" another element or
layer includes elements or layers being provided on another element
or layer and elements or layers with which another layer or another
element is interposed. On the other hand, elements being referred
to as provided "directly on" or "directly on" denote elements with
which another element or layer is not interposed.
As shown in the figures, spatially relative terms, such as "below",
"beneath", "lower", "above", "upper", and the like, may be used to
easily describe relations between one element or components and
another element or component. The spatially relative terms should
be understood as a term to encompass different orientations of the
device in use and operation in addition to the orientation depicted
in the figures.
Hereinafter, the present disclosure will be described in more
detail with reference to the drawings.
FIG. 1 is a schematic view of a self-light emitting display device
1000 according to an implementation of the present disclosure.
The self-light emitting display device 1000 includes at least one
pixel PX, a blue light emitting diode B-OLED which emits blue light
B, an encapsulation layer EC, partitions B, color conversion
patterns R-CCM and G-CCM, and a selective transmission layer
ST.
The at least one pixel PX includes a first region R1, a second
region R2, and a third region R3. The first region R1, the second
region R2, and the third region R3 may be a red pixel region, a
green pixel region, and a blue pixel region, respectively.
The blue light emitting diode B-OLED is disposed in at least one
pixel PX and emits blue light B in all directions. A portion of the
blue light B emitted above the blue light emitting diode B-OLED is
emitted to the first region R1 and the second region R2 and is
converted into light in a long wavelength band, by the color
conversion patterns R-CCM and G-CCM compared to the blue light B so
as to be emitted from the self-light emitting display device 1000.
Another portion of the blue light B emitted above the blue light
emitting diode B-OLED is emitted to the third region R3 and does
not pass through the color conversion patterns R-CCM and G-CCM, and
may be emitted from the self-light emitting display device 1000 in
a state of blue light B.
The blue light emitting diode B-OLED may include an organic layer
(not shown) interposed between an anode (not shown) and a cathode
(not shown), and the organic layer (not shown) may include a hole
transport layer (not shown), a blue light emitting layer (not
shown), and an electron transport layer (not shown). The organic
layer (not shown) may further include a hole injection layer (not
shown) and/or an electron injection layer (not shown)
selectively.
The encapsulation layer EC may be disposed on the blue light
emitting diode B-OLED to prevent moisture or air, and the like,
from penetrating into the blue light emitting diode B-OLED from the
outside, and to protect the blue light emitting diode B-OLED from
an external shock. The encapsulation layer EC may include a first
part disposed between the blue light emitting diode B-OLED and the
partitions B and a second part disposed between the blue light
emitting diode B-OLED and a bottom portion ST1 of a selective
transmission layer ST. The encapsulation layer EC may be formed of
a single layer and the first part and the second part may be
connected to each other.
The partitions B are spaced apart from one another on the
encapsulation layer EC and a first region R1, a second region R2
and a third region R3 of at least one pixel PX may be defined by
the partitions B. Specifically, the partitions B may be divided
into a first partition, a second partition, and a third partition.
The first region R1 may be defined as a region between the first
partitions, and the second region R2 may be defined as a region
between the first partition and the second partition, and the third
region R3 may be defined as a region between the second partition
and the second partition. The partitions B may be made of, for
example, a black photoresist including black pigment and a
photosensitive resin.
The selective transmission layer ST may transmit the blue light B
emitted from the blue light emitting diode B-OLED and reflect the
red light R and the green light G. The selective transmission layer
ST may have a structure in which a layer of low refractive index
inorganic material and a layer of high refractive index inorganic
material are alternately laminated. The structure in which the
layer of the low refractive index inorganic material and the layer
of high refractive index inorganic material are laminated
alternately may cause optical interference that selectively
reflects or transmits light of a specific wavelength due to
interlayer interference. The selective transmission layer ST may
selectively reflect the red light R and the green light G by
controlling a difference in refractive index between the layer of
the low refractive index inorganic material and the layer of high
refractive index inorganic material and a difference in thickness
between the layer of the low refractive index inorganic material
and the layer of high refractive index inorganic material.
The selective transmission layer ST includes a bottom portion ST1
and a wall portion ST2 connected to the bottom portion ST1. The
bottom portion ST1 may be disposed on the encapsulation layer EC
and may be disposed between the encapsulation layer EC and the
color conversion patterns R-CCM and G-CCM. The wall portion ST2 may
be disposed at a side of the partitions B and may be disposed
between the color conversion patterns R-CCM and G-CCM and the
partitions B.
The selective transmission layer ST may be divided into a first
selective transmission region and a second selective transmission
region. The first selective transmission region corresponds to the
first and second regions and the second selective transmission
region corresponds to the third region.
The color conversion patterns R-CCM and G-CCM may be disposed
between the partitions B above the encapsulation layer EC and,
specifically, may be disposed in the first selective transmission
region. The color conversion patterns R-CCM and G-CCM include a red
color converting unit R-CCM and a green color converting unit
G-CCM, and the red color converting unit R-CCM is disposed on the
bottom portion ST1 and the wall portion ST2 in the first selective
transmission region, at the first region R1, and the green color
converting unit G-CCM is disposed between the bottom portion ST1
and the wall portion ST2 in the first selective transmission
region, at the second region R2.
The red color converting unit R-CCM may be disposed between the
partitions B in the first region R1 and may convert the blue light
B which is emitted from the blue light emitting diode B-OLED and is
incident on the red color converting unit R-CCM through the
encapsulation layer EC and the bottom portion ST1 in the first
selective transmission region into the red light R.
The green color converting unit G-CCM may be disposed between the
partitions B in the second region R2 and may convert the blue light
B which is emitted from the blue light emitting diode B-OLED and is
incident on the green color converting unit G-CCM through the
encapsulation layer EC and the bottom portion ST1 in the first
selective transmission region into the green light G.
The red light R emitted from the red color converting unit R-CCM
toward the bottom portion ST1 and the wall portion ST2 of the first
selective transmission region is reflected by the bottom portion
ST1 and the wall portion ST2, and is recycled. The red light G
emitted from the green color converting unit G-CCM toward the
bottom portion ST1 and the wall portion ST2 of the first selective
transmission region is reflected by the bottom portion ST1 and the
wall portion ST2 and is recycled. Light extraction efficiency of
the self-light emitting display device 1000 may be improved by the
selective transmission layer ST.
The color conversion patterns R-CCM and G-CCM include color
conversion material, and examples of the color conversion material
may include a Quantum Dot, a fluorescent dye or a combination
thereof. Examples of the fluorescent dyes include organic
fluorescent materials, inorganic fluorescent materials, and a
combination thereof.
The quantum dots may adjust an emission wavelength by only
adjusting a size of a particle of the quantum dots based on a
quantum confinement effect. The quantum dot may be selected from,
but is not limited to, a Group II-VI compound, a Group III-V
compound, a Group IV-VI compound, a Group IV element, a Group IV
compound, and a combination thereof. The Group II-VI compounds may
be selected from the group consisting of a binary compound selected
from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS,
HgSe, HgTe, MgSe, MgS and a mixture thereof; a trivalent compound
selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS,
ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS,
CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and a mixture
thereof; and a quaternary compound selected from the group
consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS,
CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and a mixture
thereof. The Group III-V compound may be selected from the group
consisting of a binary compound selected from the group consisting
of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb
and a mixture thereof; a trivalent compound selected from the group
consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb,
AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP and a
mixture thereof; and a quaternary compound selected from the group
consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs,
GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs,
InAlPSb and a mixture thereof. The Group IV-VI compound may be
selected from the group consisting of a binary compound selected
from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and
a mixture thereof; a trivalent compound selected from the group
consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS,
SnPbSe, SnPbTe, and a mixture thereof; and a quaternary compound
selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe,
and a mixture thereof. The Group IV elements may be selected from
the group consisting of Si, Ge, and a mixture thereof. The Group IV
compound may be the binary compound selected from the group
consisting of SiC, SiGe, and a mixture thereof.
At this time, the binary compound, the trivalent compound, or the
quaternary compound may be present in a particle at a uniform
concentration, or may be present in the same particle with
different concentration distributions from one another. The binary
compound, the trivalent compound, or the quaternary compound may
have a core/shell structure in which one quantum dot surrounds
another quantum dot. At an interface between the core and the
shell, a concentration gradient in which the concentration of the
element present in the shell is lowered toward a center of the
quantum dots may be provided.
The quantum dot may have a full width of half maximum (FWHM) of an
emission spectrum of about 45 nm or less, preferably about 40 nm or
less, more preferably about 30 nm or less, thereby improving color
purity or color reproducibility in this range. Further, the light
generated by the quantum dots is emitted in all directions, so that
a viewing angle range may be enhanced.
Further, a shape of the quantum dots is not particularly limited to
a generally used form and, more specifically, the shape of the
quantum dots may be a nanoparticle which has a spherical shape, a
pyramidal shape, a multi-arm shape or a cubic shape, a nanotube,
nanowires, nanofibers, nano-sized particles having a plate shape,
and the like.
Examples of fluorescent dye may include a red fluorescent dye, a
green fluorescent dye, a dye which emits light of a third color
other than the red and the green or a combination thereof. The red
fluorescent dye may be a material which absorbs the light in the
green wavelength band and emits the light in the red wavelength
band and, may be, for example, at least one of (Ca, Sr, Ba)S, (Ca,
Sr, Ba)2Si5N8, CaAlSiN3, CaMoO4, Eu2Si5N8. The green fluorescent
dye may be a material which absorb the light in a blue wavelength
band to emit a light in the green wavelength band and may be at
least one of, for example, yttrium aluminum garnet, YAG), (Ca, Sr,
Ba)2SiO4, SrGa2S4, barium magnesium aluminate (BMA), alpha-SIALON
(.alpha.-SiAlON), beta-SIALON (.beta.-SiAlON), Ca3Sc2Si3O12,
Tb3A15O12, BaSiO4, CaAlSiON, (Sr1-xBax)Si2O2N2.
The color conversion patterns R-CCM and G-CCM may be formed by
filling ink composition including a color conversion material in a
space surrounded by the bottom portion ST1 and the wall portion ST2
of the first selective transmission region. That is, the color
conversion patterns R-CCM and G-CCM may be formed using ink-jet
printing. When the color conversion patterns R-CCM and G-CCM are
formed by inkjet printing, a process of high-temperature plasticity
at about 230.quadrature. may be omitted so that a number of
processes may be reduced compared to the case in which the color
conversion patterns R-CCM and G-CCM are formed through photocuring,
thereby enhancing efficiency of a process of forming the color
conversion pattern.
Meanwhile, the self-light emitting display device 1000 has a
structure of color filter unit on encapsulation (CoE). A
manufacturing process of the structure of CoE includes forming an
encapsulation layer EC on the blue light emitting diode B-OLED,
forming partitions B on the encapsulation layer EC, depositing a
selective transmission layer ST on the encapsulation layer EC and
the partitions B, and forming the color conversion patterns R-CCM
and G-CCM by inkjet printing, in which the above-mentioned
processes are performed sequentially and continuously.
In the related art, in a general self-light emitting display
device, an upper substrate including the color filter pattern and a
lower substrate including the encapsulated light emitting diode are
prepared in separate processes from each other, and subsequently
the upper substrate and the lower substrate are attached together
using a filling agent.
The structure of the CoE enables eliminating the need for
attachment between the upper substrate and the lower substrate,
thereby reducing misalignment error between the upper substrate and
the lower substrate. Further, as no filling agent is required, it
is possible to prevent an increase in thickness of the display
device due to the filling agent and it is not required to attach
the color filter substrate to the lower substrate, thereby
preventing an increase in thickness of the display device due to
the filling agent.
The self-light emitting display device 1000 may further include a
color filter pattern Y-CF which selectively absorbs the blue light
B. The color filter pattern Y-CF may include a first color filter
unit Y-CF1 and a second color filter unit Y-CF2. The first color
filter unit Y-CF1 may be disposed in the first region R1 and may be
disposed on the red color converting unit R-CCM between the wall
portions ST2 of the first selective transmission region. The second
color filter unit Y-CF2 may be disposed in the second region R2 and
may be disposed on the green color converting unit G-CCM between
the wall portions ST2 of the first selective transmission
region.
The first color filter unit Y-CF1 and the second color filter unit
Y-CF2 may include a yellow dye having weak light resistance and a
thermosetting resin. Examples of the yellow dye having weak light
resistance may include azo-based yellow dye. The azo-based yellow
dye has a feature of color shift depending on changes in a chemical
structure when the azo-based yellow dye is exposed to a fluorescent
light source and has a weak light resistance compared to other dyes
which has different structures from the azo-based yellow dye.
Examples of the azo-based yellow dyes may include C.I reactive
yellow, and examples of C.I reactive yellow may include, but is not
limited to, C.I Reactive Yellow 1, 2, 3, 4, 5, 13, 14, 15, 16, 17,
18, 22, 23, 25, 35, 36:1, 37, 39, 42, 44, 45:1, 55, 57, 66, 72, 76,
78, 81, 84, 85, 86, 95, 105, 107, 121, 133, 135, 138, 143, 145,
148, 151, 154, 156, 157, 158, 160, 161, 162, 164, 167, 174, 176,
178, 179, 184, 185, 186, 193, 201, 202, 205, 206, 207, 208, 209,
210, 211, 212 and 213.
The first color filter unit Y-CF1 absorbs blue light B which is not
converted, by the red color converting unit R-CCM, into the red
light R among the light incident on the color filter unit via the
red color converting unit R-CCM, thereby enhancing color purity of
the self-light emitting display device 1000. The second color
filter unit Y-CF2 absorbs the blue light B which is not converted,
by the green color converting unit G-CCM, into the green light G
among the light incident on the color filter unit via the green
color converting unit G-CCM, thereby improving the color purity of
the self-light emitting display device 1000.
In addition, the color filter pattern Y-CF may absorb external
light to improve a degree in which the reflected light is visually
sensed of the self-light emitting display device 1000.
The third region R3 does not include the color conversion patterns
R-CCM and G-CCM, and a white resin layer WR may be disposed in the
second selective transmission region of the selective transmission
layer ST. The second selective transmission region includes a
bottom portion ST1 disposed between the white resin layer WR and
the blue light emitting diode B-OLED and a wall portion ST2 which
extends from the bottom portion ST1 and is disposed between the
white resin layer WR and the partitions B.
The white resin layer WR may transmit the blue light B which is
emitted from the blue light emitting diode B-OLED and is incident
on the white resin layer WR through the encapsulation layer EC and
the bottom portion ST1 in the second selective transmission region.
The white resin layer WR may be disposed between the partitions B
at the upper portion of the encapsulation layer EC, and
specifically, may be disposed on the bottom portion ST1 and the
wall portion ST2 in the second selective transmission region in the
third region R3.
FIG. 2 is a schematic view of a self-light emitting display device
1100 according to another implementation of the present disclosure.
Hereinafter, repetitive description of the contents described with
reference to FIG. 1 will be omitted. The self-light emitting
display device 1100 is different from the self-light emitting
display device 1000 in that the selective transmission layer ST
further includes a ceiling ST3 which covers an upper surface of the
partitions B. The ceiling ST3 may be connected to the wall portion
ST2 to provide a selective transmission layer ST in a form of a
single layer.
In the self-light emitting display device 1000, as external light
is absorbed at the upper surface of the partitions B made of black
photoresist, the external light reflectance may be lowered compared
to the self-light emitting display device 1100. In the self-light
emitting display device 1100, the upper surface of the partitions B
made of black photoresist is covered by the ceiling ST3, thereby
external reflectance of the self-light emitting display device 1100
may increase compared to the self-light emitting display device
1000 in which the ceiling ST3 is not present.
While the present disclosure has been described with reference to
the accompanying drawings, it is to be understood that the present
disclosure is not limited to the above implementations, and the
disclosure may be made in various manners in combination of matters
disclosed in each implementation and those skilled in the art to
which the disclosure pertains can understand that the disclosure
may be implemented in other specific manners without changing the
technical idea or necessary feature of the disclosure. Thus, it is
to be understood that the above-described implementations are to be
considered in all respects as illustrative and not restrictive.
* * * * *